Mockaroo vs Mock Service Worker
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
From $60 per year (indicative, Silver)
Free tierFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
Cheap for what it does; higher tiers raise row limits and add API quota.
Free and open source. You pay in engineering time and CI minutes.
Free tier
Free for up to 1,000 rows per download and a limited number of saved schemas.
Everything, self-hosted
Open source
MIT
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Established
Mockaroo LLC · since 2014
Category standard
OSS community · since 2020
Strengths
- No code required — an analyst or tester can design a dataset themselves.
- Very large library of realistic field types including regional formats.
- Formula fields allow simple business rules between columns.
- One set of handlers reused across unit, component, E2E and local development.
- Application code is completely unaware it is being mocked — no test-only branches.
- Supports REST and GraphQL with the same model.
Limitations
- Referential integrity across related tables is limited.
- Free-tier row limits are low for realistic volume testing.
- Data is generated on a third-party service, which needs a privacy check for schema sensitivity.
- JavaScript ecosystem only.
- Service Worker registration adds a setup step and occasional caching confusion.
- Handlers can drift from the real API without contract verification.
Best for
Quickly producing a realistic dataset for a demo, a load test or a new environment.
Front-end teams that want one mocking approach across every kind of test.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.